scholarly journals Microstructure and magnetic properties of as-quenched and heat-treated (Nd,Dy)FeB powders produced by high pressure gas atomization

1999 ◽  
Vol 85 (8) ◽  
pp. 5678-5680 ◽  
Author(s):  
J. E. Snyder ◽  
C. C. H. Lo ◽  
X. Fang ◽  
B. Kriegermeier ◽  
D. C. Jiles
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
Gas Atomization ◽  
Heat Treated ◽  
Microstructure And Magnetic Properties

Microstructure and Magnetic Properties of Rapidly Solidified Sm(CobalFe0.11Cu0.10Zrx)7 Alloys

2014 ◽  
Vol 893 ◽  
pp. 357-360
Author(s):  
Li Ya Li ◽  
Yi Cheng Ge ◽  
Yuan Dong Peng
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Systematic Study ◽  
Structure Type ◽  
Zr Addition ◽  
Heat Treated ◽  
Intrinsic Coercivity ◽  
Structural And Magnetic Properties ◽  
Rapidly Solidified ◽  
Microstructure And Magnetic Properties

We reported a systematic study of the effect of Zr content on the structural and magnetic properties of rapidly quenched Sm (CobalFe0.11Cu0.10Zrx)7 alloys with x varying from 0 to 0.04. The results show that the addition of Zr greatly affected the microstructure and magnetic properties of the heat-treated ribbons. The Zr-free ribbon had crystallized as the 1:7H structure as the main phase while the ribbon with Zr addition adopted the 2:17R structure type. A Sm2Co7 phase was observed in the heat-treated ribbons when the Zr content x increased to 0.04. It is found that while the Zr content was increased from 0 to 0.04, saturation magnetization of the heat-treated ribbons was decreased from 11.9kGs to 3.3 kGs, and the intrinsic coercivity was increased from 0.07 kOe to 11.7 kOe. The highest intrinsic coercivity, Hci=11.7 kOe, was obtained in the ribbon with Zr content of 0.03.

Effect of Heat Treatment on Microstructure and Magnetic Properties of Strontium Hexaferrite Nanoparticles Prepared in Presence of Non-Ionic Surfactant

2013 ◽  
Vol 202 ◽  
pp. 193-205
Author(s):  
Nital R. Panchal ◽  
Rajshree B. Jotania
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Tween 80 ◽  
Strontium Hexaferrite ◽  
Ionic Surfactant ◽  
Treatment Conditions ◽  
Heat Treated ◽  
Higher Temperature ◽  
Co Precipitation ◽  
Microstructure And Magnetic Properties

SrFe12O19 hexaferrite particles containing polyoxyethelene (20) sorbitan monolate (Tween-80) were synthesized by a chemical co-precipitation technique with a precipitator NH3.H2O. The prepared Sr-M hexaferrite precipitates were heat treated at various temperatures 650 oC, 750 oC, 850 oC, 950oC and 1100oC for 4 hrs in a muffle furnace. The obtained Sr-M powders were characterized by using various instrumental techniques, like FTIR, TGA, XRD, SEM, VSM and Mössbauer spectroscopy. Their physical as well as Magnetic properties were compared. It was observed from XRD results that heat treatment conditions play significant role in the formation of pure SrFe12O19 hexaferrite phase and also in the grain size. The estimated particle size is of the order of nanometer when suitable calcination temperature is applied. SEM micrographs show an increase in crystallite size of the resultant SrFe12O19 hexaferrite particles sintered at higher temperature (1100 oC). Mössbauer spectroscopic measurements were carried out at room temperature. Mössbauer analysis indicates the presence Fe3+ ions in the prepared strontium hexaferrite particles.

Microstructure and Magnetic Properties of Two Phase β+γ Ferromagnetic Co-Ni-Al Alloys

2009 ◽  
Vol 154 ◽  
pp. 145-150 ◽  
Author(s):  
Wojciech Maziarz ◽  
Jan Dutkiewicz ◽  
Rafał Wróblewski ◽  
Marcin Leonowicz
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Magnetic Phase ◽  
Scanning Calorimetry ◽  
Two Phase ◽  
Ferromagnetic Alloys ◽  
Transmission Electron ◽  
Heat Treated ◽  
Phase Transition Temperatures ◽  
Microstructure And Magnetic Properties

The microstructure, texture and magnetic properties of two ferromagnetic alloys of composition Co35Ni37Al28 and Co37Ni35Al28 (in at. %) were investigated with optical microscopy (OM), analytical transmission electron microscopy (TEM), scanning electron microscopy (SEM) techniques as well as a vibrating sample magnetometer (VSM). The alloys were plastically deformed and heat treated in order to promote the martensitic transformation. Differential scanning calorimetry (DSC) revealed a drop of Ms temperature due to the increase of Co content in the alloys. The elongated twinned grains of size about 200 m and small precipitates of  phase were identified with the OM techniques. The TEM observations showed the twinned L10 non modulated martensite within the elongated grains and a small amount of ordered ’ phase after the heat treatment. The chemical composition of different martensite grains was established using point analyses of a HAADF-EDS technique. The magnetic phase transition temperatures were determined on the deformed samples using VSM method.

scholarly journals Microstructure and Magnetic Properties of Grain Refined Pr2Co14B Melt-Spun Ribbons

2019 ◽  
Vol 5 (1) ◽  
pp. 6
Author(s):  
I. Nlebedim ◽  
M. Huang ◽  
K. Sun ◽  
L. Zhou ◽  
R. McCallum ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Anisotropy Field ◽  
Triple Junctions ◽  
Heat Treated ◽  
Melt Spun ◽  
The Matrix ◽  
Melt Spun Ribbons ◽  
Low Solubility ◽  
Microstructure And Magnetic Properties

The correlation between the grain refining effect of TiC on the microstructure of Pr2Co14B melt-spun ribbons and the magnetic properties is presented in this study. TiC enabled greater control of microstructure both in the as-spun and heat treated Pr2Co14B, compared with the material without TiC. As a result, coercivity of the sample with TiC was nearly twice that of the sample without TiC. In addition to Pr2Co14B, two other phases were found in the sample with TiC: one rich in Co and the other having a composition near PrCo2. TiC was found near the grain boundaries and at triple junctions. Also no Ti or C was found in the matrix phase indicating extreme low solubility of the elements when both are present with Pr2Co14B. As expected, both the samples with and without TiC have similar anisotropy field but the presence of room temperature non-ferromagnetic phases (TiC and PrCo2), caused a small decrease in magnetization of the sample with TiC although the romance of the isotropic materials were comparable.

The Magnetic Properties of Fe-6.5wt.%Si Alloy Powders Produced by High Pressure Gas Atomization

2013 ◽  
Vol 800 ◽  
pp. 302-307
Author(s):  
Ke Xie ◽  
Chang Jiang Song ◽  
Ke Feng Li ◽  
Liang Zhu ◽  
Qi Jie Zhai
Keyword(s):  
Heat Treatment ◽  
High Pressure ◽  
Magnetic Properties ◽  
Atmospheric Environment ◽  
Powder Size ◽  
Soft Magnetic Properties ◽  
Gas Atomization ◽  
Vibrating Sample Magnetometer ◽  
Soft Magnetic ◽  
Optimal Capacity

The soft magnetic properties of Fe-6.5wt.%Si alloy powders produced via high pressure gas atomization under different powder sizes, environments (atmospheric and vacuum) and heat-treatment were presented by vibrating sample magnetometer (VSM), respectively. It is found that the soft magnetic properties of powder gradually grow up as the increasing of the powder size under atmospheric and vacuum environments. However, the using of vacuum environment has an optimal capacity to strengthening the properties rather than atmospheric environment. The heat-treatment of 1000°C for 2 hours offers considerable potential for improving the soft magnetic properties of the powders.

Microstructure and magnetic properties of Sm2(Fe, Si)17Cx/α-Fe nanocomposite magnets prepared under high pressure

1999 ◽  
Vol 74 (4) ◽  
pp. 597-599 ◽  
Author(s):  
X. Y. Zhang ◽  
J. W. Zhang ◽  
W. K. Wang ◽  
W. Yu ◽  
J. H. Zhao ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
Nanocomposite Magnets ◽  
Microstructure And Magnetic Properties

scholarly journals Microstructure and magnetic properties of Mn-Al-C permanent magnets produced by various techniques

2021 ◽  
Vol 8 ◽  
pp. 10
Author(s):  
Vladimir V. Popov ◽  
Fernando Maccari ◽  
Iliya A. Radulov ◽  
Aleksey Kovalevsky ◽  
Alexander Katz-Demyanetz ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
Electron Beam Melting ◽  
Permanent Magnets ◽  
High Pressure Torsion ◽  
Hot Extrusion ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Processing Window ◽  
Microstructure And Magnetic Properties

Bulk Mn52Al46C2 in τ-phase was prepared by vacuum induction melting and used as precursor for the production bulk permanent magnets by suction casting and hot-extrusion. Part of the precursor alloy was mechanically milled into a τ-phase powder and used as precursor for production of samples by electron beam melting, hot-compaction and high pressure torsion processes. The microstructure and magnetic properties of all samples were investigated and correlated. It was found that the mechanical deformation enhances coercivity, up to 0.58 T, while the absence of this strain is beneficial for magnetization. Among the observed techniques, hot extrusion and high pressure torsion have shown promising possibilities to further develop Mn-Al-C as permanent magnets. However, it should be taken into account the challenges related to design a proper processing window for hot extrusion and the limitation of HPT regarding the absence of texture.

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